Video camera pedestal

I want to know how these camera pedestals work, see example here:

Has anyone tried to build something similar?
What I would like to achieve, is simply a tripod system where the camera can stay level at the height I choose, and it should be easy to change the height without loking the center column.
Is this a very hard thing to do?

Re-design7 years ago
Read this article in Make and adapt for your own uses.